Calculation of cost savings Print

An online cost per image and savings calculation can be made using the below link. The following variables can be customised in the calculation:

initial investment value of digital and analogue systems

number of images made per day

number of working days per week

readability factor of analog and digital images

film and developer costs

chemical waste handling cost

image archiving and storage cost.

Link to Customise Savings online.

Assumptions for the cost comparison of a digital system versus an analog one are given below. Most of this data is self-explanatory.

On the basis of studies published by specialists (including Dr. Ikushi Onozaki of the WHO/StopTB), it is assumed in below calculation that 35% of these images taken by analog X-ray are substandard or unreadable due to many factors including the wrong positioning of the patient, under and over exposure, inadequate developing (due to erroneous techniques, poor films or substandard chemicals) and wear and tear of stored images.

Using a direct digital X-ray, the positioning of the patient is practically the only thing that can go wrong. While a small percentage of the images may therefore have to be retaken, with a digital camera this can be done immediately, without having to wait for the developing process to culminate and without any additional expenses.

Initial investment assumptions
Direct Digital X-ray € 145,000
Analog Camera (incl. developer) € 25,000
Depreciation period (years) 10.00
Variable cost per image
Direct Digital X-ray memory per image:
€ 0,01
Analog Camera:
Film per sheet 35x43 cm € 1.6
Developer € 0.3
Chemical waste handling € 0.2
Archiving & Storage of films € 0.4
Maintenance life cycle (over 10 years) High Medium Low
Direct Digital X-ray € 60,000 € 55,000 € 30,000
Analog Camera € 25,000 € 20,000 € 15,000
Readability & image availability factor
Direct Digital X-ray 1.00 1.00 1.00
Analogue Camera 0.65 0.65 0.65
Throughput per day per system High Medium Low
Direct Digital X-ray 300 120 50
Analogue Camera 300 120 50
Working days (per year) 250 250 250
Direct Digital X-ray (number of units) 1 1 1
Analogue Cameda (number of units) 1 1 1

Result with these assumptions

High Medium
Low
Annual cost
Direct Digital X-ray € 24,150 € 21,216 € 18,835
Analogue Camera
€ 257,692
€ 128,846
€ 46,154
Savings
€ 233,542 € 107,630
€ 27,319
Cost per image
Direct Digital X-ray 
€ 0.32 € 0.57
€ 1.51
Analogue Camera
€ 3.44 € 3.44
€ 3.69
Payback Period 0.8 years
1.7 years
6.8 years